Thats more of a manual way to do it. How would the board be able to read the scale? I like the idea of using buoyancy and a pressure sensor. If you use a refractor is the amount of UV radiation small enough not to alter the flavor of the beer?
I only have a software background, so implementing a single sensor is like a mystery to me.
I have been researching ways to use a couple of different existing sensors that could be used to determine the abv.
-Take temperature readings
-Find a way to calculate a Density reading, mass of...
I'm also workign on an embedded sensor to use with an arduino. Likewise, I want it to be a cheap way < 50 to do so. There should probably be a new thread on this to reduce redundancy
https://www.homebrewtalk.com/f51/digitial-hydrometer-sensor-267405/
This is a pic from the day before this thread was started. Presently, the cider is clearing up nicely. The goal was to make a high alcohol cider that is drinkable within < 2 months for less than 20 bucks. So far it seems easier than I imagined